Door stop



March 9, 1965 H. JAMlsoN 3,172,144

nooR sToP Filed Jan. 29. 1962 INVENTOR. Mwy ,JAM/501V Arran/5x UnitedStatesA Patent 0 3,172,144 DOOR STOP Harry Jamison, 162-01 Powell CoveBlvd., Beechhurst, N .Y. Filed Jan. 29, 1962, Ser. No. 169,467 1 Claim.(Cl. 16-86) ting cap is made of resilient material such as polyethylene,v

to act as a shock absorber when struck by the door, and to preventshattering of the cap.

Still another object of this invention is to provide in a dor stop ofthe character described, a spline on the rod and a plurality oflongitudinal radial grooves in the tubular cap to selectively receivethe spline on the rod.

Yet another object of this invention is to provide in a door stop of thecharacter described, a rod having an integral collar or flange at theend of the drive screw to limit penetration of the drive screw into thewall, and to limit movement of the cap onto the rod to keep the outerend of the rod `spaced from the end wall of the cap.

Yet another object of this invention is to provide a door stop of thecharacter described, in which the cap v has radial, inwardly-extendinglongitudinal ribs, the inner edges of which serve to center the rodwithin the cap, with the spaces between the ribs forming slots orgrooves for the spline on the rod.

A further object of this invention is to provide a door stop of thecharacter described, in which the cap has at its inner, open end, anannular, outwardly-extending flange adapted to contact the wall to whichthe door stop is attached.

Still a further object of this invention is to provide a strong anddurable door stop of the character described, which shall be relativelyinexpensive to manufacture, easy to install, in which the cap isreplaceable if damaged, and which shall yet be practical and eiiicientto a high degree in use.

Other objects of this invention will in part be obvious and in parthereinafter pointed out.

The invention accordingly consists in the features of construction,combination of elements, and arrangement of parts, which will beexemplified in the construction hereinafter described, and of which thescope of invention will be indicated in the following claim.

In the accompanying drawing, in which is shown an illustrativeembodiment of the present invention,

FIG. 1 is a top plan v-iew of a door stop mounted on a wall;

FIG. 2 is an inner end view of the door stop;

FIG. 3 is a cross-sectional View taken on line 3 3 of FIG. 2; and

FIG. 4 is an enlarged cross-sectional view taken on line 4-4 of FIG. 3.

Referring now in detail to the drawing, 10 designates a door stopembodying the invention mounted on a wall 11. Door stop 10 comprises arod 12 made of metal, preferably case-hardened steel, and anon-metallic, tubular cap 13 demountably mounted on the rod.

The rod 12 comprises a shank 14 of round crosssection having anintermediate, flattened portion 15 passing through the axis of the shankand forming splines 16 extending in opposite directions radially beyondthe periphery of said shank.

At the inner'end of the shank is an annular, outwardly extending stopflange 18. Extending beyond the flange 18 is a coaxial drive screw 19terminating in a point 20 to serve as a penetrating element.

The drive screw may be driven into wall 11 by hammering against thecenter end 21 of the shank 14, in the manner of driving a nail. Thedrive screw 19 will penetrate the wall until the flange 18 contacts thewall. The cap 13 may then be slipped onto the shank 14 with its splines15, 16.

The cap 13 is made of non-rigid material. It is preferably made ofsynthetic plastic material that has some degree of resiliency, such aspolyethylene. Said cap 13 has an end wall 30 at one end, and is open atits opposite end. The cap has an elongated tubular wall 31 formed with aplurality of inwardly-extending, longitudinal, radial ribs 32 oftriangular cross-section having inner edges 33 lying in a cylindricalimaginary surface and adapted to contact the outer cylindrical surfaceof shank 14. Between each pair of adjacent ribs 32 is aradially-extending slot 35. There are an even number of ribs and hencean even number of slots. The slots are hence arranged in opposite pairsto selectively slidably receive splines 16 of the rod. These slots areof substantially equal width throughout. The slots 35 are deeper thanthe splines 16. Air will not be trapped in the tubular cap, but can flowout through the slots.

At the inner or open end of tubular cap 13 is an outwardly-extendingange 40 having a flat end surface lilla to contact the wall 11. Theslots 35, and hence the ribs 32, taper lengthwise to a small degree,decreasing in depth from the open end of the cap to the closed end. The4inner ends of ribs 32 flare or are inclined radially outwardly towardthe open end of the cap, as at 41, and terminate short of the surface40a to provide a countersink opening 43 to receive the flange 18. Theinner edges 33 of ribs 32 are parallel to the axis of the cap, as shownin the drawing.

When the cap is fully mounted on the shank 14, the end 21 of the -shankwill be spaced from the end Wall 30 of the cap, as shown in FIG. 3.

If the cap is damaged, it may be removed and replaced easily.

It will thus be seen that there is provided a door stop in which theseveral objects of the present invention are achieved and which is welladapted to meet the conditions of practical use.

As possible embodiments might be made of the above invention, and asvarious changes might be made in the embodiment above set forth, it isto be understood that all subject-matter herein set forth or shown inthe accompanying drawing, is to be interpreted as illustrative and notin a limiting sense.

I claim:

A door stop comprising a rod having a shank, a wallpenetrating elementextending beyond said shank coaxially of the shank, said shank beingformed with a radial spline, a tubular cap having an end wall at one endand being open at its opposite end, said cap being mounted on the shankand being formed with internal longitudinal, inwardly-extending ribshaving inner edges contacting the outer periphery of the shank, and saidribs being spaced apart angularly forming a plurality of radial groovesto selectively receive said spline, said rod having a wall-engaging stopbetween the shank and said element to contact the open end of said cap,said ribs being even in number, forming an even number of grooves, saidspline being located at an intermediate portion of the shank andcomprising a flattened shank por- 3 4 tion forming oppositely extendingdiametrlc splines to 2,429,731 10/47 Roachell. be received selectivelyin a pair of opposed grooves. 2,440,170 4/48 Duefrene 16-121 ReferencesCited by the Examiner FOREIlGN PATENTS 593,603 3/59 Ita y. UNJED STATESPATENTS 5 180,915 2/36 switzerland. 918,060 4/09 Kabureck. 1,679,0737/28 Carmichael 287-128 DONLEY J. STOCKING, Primary Examiner.

2,189,048 2/40 Underhill.

